甘肃兰州地区盐渍化特征及其治理研究

Research on the Salinization Character and Control Strategy a Case Study in Lanzhou,Gansu Province

甘肃兰州地区近年来土壤盐渍化日渐加深,对农业的负面影响日益突出,分析土壤盐渍化成因类型及其特征,制定切实可行的治理措施对抑制土壤盐渍化至关重要.本文通过采用地质调查及土壤地球化学分析方法,分析了甘肃兰州地区盐渍化特征,该地区盐渍化主要有两种类型,一为黄河冲积平原(阶地)的盐渍化;二为秦王川盆地的盐渍化.盐渍化的改良、治理方法主要是推广节水型农业,减少地下水的人为补给量,从而遏制盐渍化的加剧.其次是改良排水措施,修建畅通的排灌系统,使富盐地下水、地表水形成较快的通道,从而减轻盐化作用.

In recent yeas the soil salinization has increased in Lanzhou city, Ganxu province. Its negative impact on agriculture is increasingly conspicuous. So, to analyse cause of soil anlinization types and characteristics, and to develop practical and control measures are particularly important in inhibition of soil salinization. In this paper, through the use of geological survey and soil geochemical analysis method, we analysis characteristics of soil salinization in Lanzhou, Gansu region, and put forward its governance methods and measures. That is： there are two mainly types at this area. One is the salinization of alluvial plain （terrace） of Yellow River. The other is the salinization of Qinwangchuan basin. The main improved treatment methods of salinization are promoting water-saving agricultural techniques and reducing the artificial recharge of groundwater, which can limit the increase of salinity. Besides, improving the drainage measures and constructing the smooth irrigation and drainage system are very important, which can form a repid channel for those rich salty groundwater and surface water, so that reduce the effect of salinization.